Review of atoms and molecular structure

Substances are either elements or mixtures.

• True

• False

A material whose particle composition allows heat and electricity to pass through it easily are described as having a high ____.

• conductivity

• density

• hardness

• weight

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Which properties describe elements that are nonmetal gases? Select all that apply.

• composed of an extended structure

• composed of individual atoms or diatomic molecules

• high melting point

• low melting point

• strong attractions between particles

Which of the following would be modeled by small particles made up of atoms of two kinds of elements?

• gold

• oxygen

• neon

• water

Tags

NGSS.MS-PS1-1

Which is a property of metals as a result of their extended structures of atoms?

• are poor conductors of electricity

• dissolve in water

• have low melting points

• can be hammered into sheets

Tags

NGSS.MS-PS1-1

Why does oil not dissolve in water?

• Oil is an extended structure, and water is made of polar molecules.

• Oil is an extended structure, and water is made of nonpolar molecules.

• Oil is made of nonpolar molecules, and water is made of polar molecules.

• Oil is made of polar molecules, and water is made of nonpolar molecules.

Tags

NGSS.MS-PS1-1

In a chemical formula, the number of each type of atom in the compound is shown with numbers that are ____.

• superscripts

• chemical symbols

• oxidation numbers

• subscripts

Tags

NGSS.MS-PS1-1

In general, nonmetals are ____ since they are composed of individual atoms or small molecules.

• good conductors of electricity

• malleable and ductile

• good conductors of heat

• gases at room temperature

What is a group of atoms held together by chemical bonds called?

• Nucleus

• Element

• Molecule

• Electron cloud

Tags

NGSS.MS-PS1-1

What is a small particle that makes up most types of matter?

• Molecule

• Atom

• Electron

• Proton

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5